Portable engine



y 1966 SOICHIRO HONDA 3,259,752

PORTABLE ENGINE Filed Oct. 23, 1963 2 Sheets-Sheet 1 IN VENTOR air/e045AM: 5455i, ezs Jaw-z ATTORNEY? y 1966 SOlCHlRO HONDA 3,259,752

PORTABLE ENGINE Filed Oct. 23, 1963 2 Sheets-Sheet 2 INVENTOR SLMMW BYflrzazi/we, 5955 Q9565 Jaw-2M ATTORNEYS United States Patent 4 Claims.in. 290 1 The present invention relates to an internal combustionengine, and more particularly to an engine of such a construction thatan engine body, a dynamo, a fuel tank and all other accessories arerationally arranged within a small casing :so that the same may beportable and the engine capability may be lowered as little as possible.

According to the present invention, there is provided a portable enginecharacterized in that a cylinder and a crank chamber are disposed alongthe longitudinal direction of a casing, and both ends of a crank shaftare provided with a suction fan and a dynamo, respectively, and thecasing is provided with a suction opening and an exhaust opening, and aflat fuel tank is attached to the upper surface of the casing.

In order that the invention may be clearly understood and readilycarried into effect, the same will now be explained with reference toand by the aid of the accompanying drawings, wherein:

FIG. 1 is a front view of a portable engine embodying the presentinvention,

FIG. 2 is a rear side view of the same, and

FIG. 3 is a sectional view taken along the line III III in FIG. 1.

Referring to the drawings, numeral 1 denotes a steel or iron plate madecasing which is open at its front and upper surfaces, and a front plate2 is attached to the front surface thereof detach-ably by means ofscrews 3 and 3, and a flat fuel tank 4 is attached to the upper surfacethereof detachably by means of screws 5 and 5. Numeral 6 denotes acarrying handle attached to the upper surface of the fuel tank 4, andnumeral 7 denotes a closure for an oil charging opening of the fueltank, which closure 7 is placed deflected slightly from the right belowof the handle 6. Numeral 8 is a rear plate of the casing 1.

Within the casing 1 and at a position deflected from the center of thecasing towards the rear plate 8, as shown in FIG. 2, an engine bodycomprising a cylinder 9 and a crank chamber 10. connected thereto isplaced in such a manner that the longitudinal direction thereof issubstantially in coincidence with the longitudinal direction of thecasing 1, and the same is fixed to the bottom plate 33 of the casing 1by means of a screw 10A. Both ends 11A and 11B of a crank shaft projectoutwardly from both sides of the crank chamber 10 as shown in FIG. 3,and a suction fan 12 having blades 13 is fixed to the crank shaft end11A on the rear plate 8 side, and at the position opposed thereto therear plate 8 is swelled to form a raised plate 14 in which a suctionopening 15 is made. A rotor 16 of a dynamo is attached to the other sidecrank shaft end 11B by means of a pin 17 and a nut 18, and the stator 19of the dynamo is fixed to the side surface of the crank chamber 10 bymeans of a screw 20. Numeral 21 denotes a screw rod extending outwardlyfrom the crank shaft end 11B to which is to be attached a transmissionwheel or the like for taking out a power. A suction blade 22 is attachedto the stator 19 by a screw 23, and at the position opposed thereto acircular opening 24 is made in the front plate 2, and a covering plate25 therefor is attached thereto detachably by a screw 26. Numeral 27denotes a suction opening made in the covering plate 25.

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On the side of the stator 19 and between the front plate 2 and theengine 9, a space 28 is formed, and a heat insulating plate 29 whichserves also as a partition plate is fixed to the cylinder 9, and acarburetor 30 disposed within the space 28 is fixed through theinsulating plate 29 to the cylinder 9. Numeral 56 denotes a space formedon the other side of the partition plate 29. The lower end of thisinsulating plate 29 pierces through the bottom plate 33 to project outthe casing 1. A flexible oil supply pipe 31 projects upwardly from thecarburetor 30 for being inserted dctachably to an oil supply pipe 32existing at the bottom surface of the fuel tank as shown in FIG. 1.Within the space 28 and adjacent to the carburetor 30, an ignition coil34 is fixed to the casing 1 by means of a supporting plate 35 and ascrew 36, and an electrical meter 37 is fixed to the front plate 2 bymeans of a screw 38, and the coil 34 and electrical meter 37 areproperly connected to the stator 19 and an ignition plug 39 (FIG. 2) ofthe engine. If it is intended that the output of the dynamo is takenout, the rear side of the fuel tank 4 is concaved and a plug socket 40is attached thereto.

In FIG. 2, a muffler 43 is fixed through a heat insulating plate 42 toan exhaust pipe 41, which serves also as an attaching member, of thecylinder 9. Numeral 44 denotes an exhaust opening therefor, and numeral45 denotes a communication opening made in the side plate 46 of thecasing '1 at the position opposed to the opening 44, and numerals 47 and48 denote ventilation openings for cooling the mufiler. As shown inFIGS. 2 and 3, the .side plate 46 is provided at the position opposed tothe cylinder 9 with an exhaust opening 49, and at the position opposedto the ignition coil 34 with an exhaust opening 50, and the front plate2 is provided with a suction opening 30A opposed to the carburetor 30.

In FIG. 1, four spacers 51 are fixed to the bottom surf-ace of thebottom plate 33, and a heat insulating plate which is almost equal insize to the bottom plate 33, a receiving plate 53 therefor and four legpieces 54 are attached to said spacers 51 by means of screws 55. Numeral57 denotes a space formed between the bottom plate 33 and the heatinsulating plate 52. As in the conventional case, the carburetor 30 isprovided with a control lever (not shown), and is so constructed thatthe lever may be operated at the outside of the casing 1.

The portable engine of this invention, as described above, is soconstructed that the cylinder 9 and the crank chamber 10 are arrangedalong the longitudinal direction of the casing 1, and both ends 11A, 11Bof the crank shaft are provided with the suction fan 12 and the dynamo16, 19, respectively, and a flat fuel tank 4 is attached to the uppersurface of the casing 1. Its lower surface can be contoured to fitclosely over some of the engine components beneath it (see FIGURE 1).This lowers the engine in its center of gravity increasing itsstability. Further, this permits more complete utilization of the openspace in the engine, thereby allowing the overall size of the engine, tobe smaller. Casing 1 may be extremely small in size, and the same may becarried freely here and there for being used as a power source of smalloutput power. As the suction fan 12 inhales the air through the suctionopening 15 and discharges the same through the exhaust opening 49 forletting the air during its travel to cool the cylinder 9 and the fueltank 4, no obstruction occurs with the engine operation. Furthermore,the present invention engine canbe safe with a user because the whole ofthe same is covered by the casing 1.

In the present invention engine, furthermore, the cylinder 9 is isolatedfrom the carburetor 30 by the heat in- 3 sulating plate 29 and thecarburetor 30 is cooled separately from the cylinder 9 by the air takenin by the suc tion blades 22 through the suction opening 27 to run outthrough the exhaust opening 50, so that such an obstruction that thetemperature of the carburetor is excessively raised to bring suchobstacle as vapor lock or the like in the fuel pipe system can beprevented. Furthermore, the cylinder 9 is isolated from the muffler 43by the insulating plate 42, so that the cylinder 9 may be prevented frombeing heated by the high temperature of the muffler 43, and the mufflermay be cooled by the air flow entering through a slit 58 between theinsulating plate 42 and the rear plate 8. Furthermore, in the presentinvention device, there is provided a heat insulating plate 52 below thebottom plate 33 so that such a danger that a-floor is over-heated to beburnt or that other objects catch fire can be prevented and even when acarrying person holds the device on his lap immediately after stoppingthe operation of the device, he can be prevented from being burnt. Thepresent invention device is especially suitable for such purposes thatthe same is carried out in the fields to make a drink by the aid of amixer, or is applied to a portable television set or an electric lamp.

What I claim is:

1. A portable engine comprising, a casing with a cylinder and a crankchamber longitudinally disposed therein; said crank chamber having acrank shaft extending through it; a first suction fan; a first end ofsaid crank shaft being linked to said first suction fan; a dynamo; theother end of said crank shaft being linked to said dynamo; said casinghaving a bottom surface; a heat insulating plate fixed in spacedrelationship with the bottom of said casing and held in spacedrelationship 'by a plurality of spacing members.

2. A portable engine having a casing With a cylinder and a crank chamberlongitudinally disposed therein; said crank chamber having a crank shaftextending through it; a first suction fan; a first end of said crankshaft being linked to said first suction fan; a dynamo; the other end ofsaid crank shaft being linked to said dynamo; a second suction fan; saidother end of said crank shaft also being linked to said second suctionfan; a carburetor to feed fuel to said cylinder; a heat insulatingshield placed between and spaced away from said cylinder and saidcarburetor; two separate chambers formed by said heat insulating shieldWithin said casing; each chamber having its own suction and exhaustopenings.

3. A portable engine comprising a cylinder, a crank chamber and a poweroutput means; said engine being surrounded by a casing; said casinghaving a fuel tank comprising .a large portion of the upper covering forsaid casing; said fuel tank having a lower surface contoured to fitclosely over the top of a number of the engine components disposedbeneath it.

4. A portable engine comprising a cylinder, a crank chamber and a poweroutput means; said engine being surrounded by a casing; said casinghaving a fuel tank comprising a large portion of the upper covering forsaid casing; said power output means comprising a dynamo linked to anddriven by said cylinder through said crank chamber; and an electricoutlet electrically linked to said dynamo for drawing electric currentfrom said dynamo.

References Cited by the Examiner UNITED STATES PATENTS KARL J. ALBRECHT,Primary Examiner.

ORIS L. RADER, Examiner.

G. SIMMONS, Assistant Examiner.

1. A PORTABLE ENGINE COMPRISING, A CASING WITH A CYLINDER AND A CRANKCHAMBER LONGITUDINALLY DISPOSED THEREIN; SAID CRANK CHAMBER HAVING ACRANK SHAFT EXTENDING THROUGH IT; A FIRST SUCTION FAN; A FIRST END OFSAID CRANK SHAFT BEING LINKED TO SAID FIRST SUCTION FAN; A DYNAMO; THEOTHER END OF SAID CRANK SHAFT BEING LINKED TO SAID DYNAMO; SAID CASINGHAVING A BOTTOM SURFACE; A HEAT IN-